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holoprosencephaly

[ hŏl′ō-prŏs′ĕn-sĕfə-lē, hō′lō- ]
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n.
Failure of the forebrain to divide into hemispheres or lobes causing insufficient development of facial characteristics such as the nose, lips, and palate; in severe cases, cyclopia can occur.
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Which of the following nouns has an irregular plural form?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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